单项选择题

What is the main idea of the passage

A．Venice is sinking.
B．Venice is a dream like city.
C．It is not easy to change the timetable of the public bus service.
D．There are many historic sites in Venice.

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单项选择题

Why is Venice san sinking

A．Because people only stop using underground water for industries on the mainland.
B．Because people still make use of the underground water for all purposes.
C．Because the use of groundwater far industries on the mainland has been stopped.
D．Because people do not use the underground water any more.

单项选择题

In maple syrup (枫糖浆) production, which state produces the most

A．Both New York and Vermont.
B．Either New York or Vermont.
C．New York.
D．Vermont.